Navigation keys for a handheld device



FIG. 1 is a front perspective view of navigation keys for a handheld device;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top view thereof; and,

FIG. 4 is a left elevational view thereof.

The broken line showing of a handheld device is included for the purpose of illustrating environmental structure and forms no part of the claimed design. 

I claim the ornamental design for navigation keys for a handheld device, as shown and described. 